如何在h2数据库的sql查询中生成随机时间戳？

SELECT DATEADD('SECOND', FLOOR(RAND() * 86400), '1970-01-01 00:00:00') AS random_timestamp;

import org.h2.tools.SimpleResultSet;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Random;

public class RandomTimestampFunction {
    public static void main(String[] args) throws SQLException {
        Connection conn = DriverManager.getConnection("jdbc:h2:mem:");
        conn.createStatement().execute("CREATE ALIAS RANDOM_TIMESTAMP FOR \"com.example.RandomTimestampFunction.randomTimestamp\"");
        ResultSet rs = conn.createStatement().executeQuery("SELECT RANDOM_TIMESTAMP() AS random_timestamp");
        while (rs.next()) {
            System.out.println(rs.getTimestamp("random_timestamp"));
        }
        conn.close();
    }

    public static ResultSet randomTimestamp() throws SQLException {
        SimpleResultSet rs = new SimpleResultSet();
        rs.addColumn("random_timestamp", Types.TIMESTAMP, 0, 0);
        Random random = new Random();
        long timestamp = System.currentTimeMillis() - random.nextInt(86400000);
        rs.addRow(new Object[]{new java.sql.Timestamp(timestamp)});
        return rs;
    }
}